2 comments
Sounds very interesting. Just started looking at the paper, which seems very complex to me "An alternative approach utilizes light absorption via
localized surface plasmon resonances (LSPRs) of noble metal nanoparticles (NPs)".<p>I came across <a href="https://www.nano-resonance.com/" rel="nofollow">https://www.nano-resonance.com/</a> which appears to be the promotional page for the technique, it has a nice diagram which appears to show how the size of the silicon nanoparticle enhances certain wavelengths of light.<p>Very cool how they can use an inkjet printer for their approach.<p>Also see <a href="https://en.wikipedia.org/wiki/Lippmann_plate" rel="nofollow">https://en.wikipedia.org/wiki/Lippmann_plate</a> for a photographic process that creates colours using diffraction patterns.<p><a href="https://www.youtube.com/watch?v=-DyrBDsKA5s" rel="nofollow">https://www.youtube.com/watch?v=-DyrBDsKA5s</a> is a fun video on lippmann plates.
> Images printed with structural colour ink can be made both highly transparent to transmitted light (top) and at the same time reflect light from above in vivid colours (bottom)<p>Probably a foolish question, but wouldn't there be some unavoidable loss of brightness to the transmitted light, unless the structured color somehow "knows" to transmit light in one direction and reflect it in the other direction (which seems impossible given that it is printed by an inkjet)?
(Not an answer to your question, just a note that "top" and "bottom" refer to the illustration in the article -- the authors printed a printed a vivid color logo on what appears to be a smartphone screen. With the screen on, the image on the display shines through the design printed on top.<p>That might be a neat effect on the glass roof of a car.)